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3Com Router 5000 and Router 6000 v2.41
Module Guide
Chapter 4 Flexible Interface Cards (Router 6000)
4-45
4.14 Router 1/2-Port ADSL FIC
4.14.1 Introduction
Router 1/2-Port ADSL FIC, the 1-/2-port ADSL over PSTN interface card, allows a LAN
subscriber to connect to the digital subscriber's loop access multiplexer (DSLAM) at
the central office over a regular analog subscriber line or telephone line. Thus, the
subscriber can access the ATM/IP backbone or the Internet to enjoy services such as
high-speed data communication and video on demand (VoD).
ADSL transmits data in the high frequency band above 26 kHz. Therefore, it can
provide services without interfering with the voice service being provided in the low
frequency band (0 to 4 kHz) on the same line. It provides downlink rates in the range
32 kbps to 8 Mbps and uplink rates in the range 32 kbps to 1 Mbps.
The ADSL interface cards provide these functions:
z Manual ADSL line activation and deactivation, supporting SAR loopback for
convenient fault isolation.
z Interface standards of G. DMT, G. Lite, and T1.413, auto-sensing.
z Trellis coding (except for G. Lite) on ADSL interfaces, enhancing stability of ADSL
connections.
4.14.2 Interface Attributes
The following table describes the interface attributes of the Router 1/2-Port ADSL FIC.
Table 4-29 Interface attributes of the Router 1/2-Port ADSL FIC
Attribute Router 1-Port ADSL FIC Router 2-Port ADSL FIC
Connector
RJ-11
Number of connectors
1 (Router 1-Port ADSL FIC)
2 (Router 2-Port ADSL FIC)
Interface standard
ITU-T 992.1 G.DMT
ITU-T 992.2 G.Lite
ANSI T1.413 Issue 2
Interface rate
In ADSL full rate mode (ITU-T 992.1 G.DMT/ANSI T1.413):
8160 kbps (downlink rate)
896 kbps (uplink rate).
Cable and the Max. transmission
segment
In full rate mode, 1.8 km (1.1 mi.) over the telephone cable
( depending on the line quality).